Rolling-mill.



O. HEER. ROLLING MEL. APPLIGATIDH FILED SEPT. 28, 1905.

Patented Jan. 26, 1909.

OTTO HEER, F ZURICH, SWITZERLAND.

ROLLING MILL.

Specification of Letters Patent.

Patented Jan. 26, 1909.

Application filed September 28, 1905. Serial No. 280,532.

To all whom it may concern:

Be it known that I, Or'ro HEER, a citizen of the Swiss Republic, resident of Zurich,

Switzerland, have invented certain new and useful Im rovements in Rolling-Mills, of which the ollowing is a specification.

This invention has for its object a'rollingmill for rolling thick-walled pipes and other hollow bodies and especiall those of copper, brass, aluminium and oter soft metals. It belongs to that group of rolling-mills which effect the lessening of the original diameter of the piece of metal by several pairs of rollers with decreasing diameters of their caliber arranged one behind the other and alternately vertically and horizontally, which are in succession brought to act upon the piece held fast by a fixed core-bar. The new feature and the advantage of the same over the systems now in use consists therein that the pairs of rollers which, before the rolling-process commences, are arranged in a row, one close behind the other, before the piece of metal to be worked and are then rolled over the fixed piece singly and quite independently of each other atany desired intervals, and on finishing th ir work they can at once be disconnected from the driv- Ling-power, and that their rolling overthe said piece is only caused by the friction of the surfaces which come in contact with each other, in both of which last named respects they difier from the rollingznil.ls now in use, in which the distance between the pairs of rollers following one another must always remain the same before, during and after their function and their rolling over the "work-piece is effected by rails moved longitudinally under a checked motion, by which the friction on the circumference of the rollers is considerably increased.

On the drawing this rollingqnill is shown in Figure 1 in a vertical section on the line in Fig. 2 in a horizontal section on the line 0-2), and in Fig. 3 in a cross-section, while Figs. 4 and 5, show the front end of the core-bar in a longitudinal section and in a front-view. I

lhe five pairs of rollers used in the construction shown in the drawing, a, b 0 al e, as well the caliberring j, which is finally to be drawn over the rolled ipe, are journaledin frames a, b, c, d, e, f o a corresponding shape, which, after adjusting two carrying-rollers on both side-walls of each frame, constitute travelers. These travelers are held and guided by two parallel rails g of a U-shaped cross-section'united at both ends by cross-pieces i and k and held by feet or supports hat a suitable height, and horizonta y, above the floor. By the two trestles at the end h and by trestles h in the middle, are carried the journals of the axles 1" and r of two pairs of chain-wheels p and united by link-chains 0 and by intermediate trestles the guiding and supporting rollers 10 of those chains.

At each of the two pins which receive the front-wheels of the single frames is suspended a bow t carrying a belt, which can be shifted lengthwise and is provided at its front end with an oscillating hook it. By being hung up on a support 1), provided on each frame, the hooks of the dillerent travelers, which are united by a cross-bar 1, can be held in their highest position.

The core-bar Z intended to receive the Work-piece z is adjusted between the two rails g and the two chains 0, according to the height and direction of the caliber centers. It is held by the hind cross-piece 1c and receives at its front end a prolongation-bar m of a smaller diameter, and w ich can be screwed OE, and whose hind end is journaled in the front cross-piece i. By a head at on the latter, whose washer lies against the outside of that cross-piece, the bar m and the core-bar Z united with it are prevented from shifting lengthwise in the direction longitur inal to the machine.

This roll ng-mill works in a way that th' travelers, which constitute the supports or the single pairs of working-rollers, are, after having previously been pushed one close be: hind the other against t is front cross-piece t of the rails g, coupled one after the other, by means oft 1e hooks a to the link-chains 0 and are by these chains drawn over the workpiece a on the front end of the core-bar Z, whereby, under the action of the single pairs of rollers, an increased reduction of the diameter and a corresponding elongation of the respective piece is caused. After doing their work the single travelers are at once uncoupled from the chains and the one which has been uncoupled last is pushed forward by the next, so that finally, after the termina tion of the rolling-process all the roller frames are united in a row, one behind the other on the hind end of their supports, from which they are, after the ready pipe has been removed, pushed back all together into their "initial position.

In order to prevent the workiece z from shifting on its core-bar Z,,when-t l 1e first pair of rollers begins to work, a cone 'n has been provided on the front-end'of the core-bar, and held in its place on the prolongation-bar m, with which it is concentrlc, the mantle of which .cone is provided with a number of notches n (Figs. 4 and 5); Into these notches the material of the work-piece which is slightly tapering in the inner and outer diameter, is pressed by the first rollers and in this way there is obtained a sufficient resistance against the shifting actionof these and to secure the following rollers.

The hooks u" can be uncoupled from the link-chains o by hand, or also automatically, which is effected by pushing upwards the connecting-rods 1 of any two.hooks belong-' ing together and which serve, in both forms of construction, to limit the deepest position of the hooks by their resting on the upper surface'of the longitudinal su ports or rails g,

on the slanting surfaces 0 wedge-shaped which the frames are movably supported,

means formoving the framesindependently of each other on said track and means for holding the work piece in the path of the rollers.

2. In a rolling machine, a plurality of frames, a pair of rollers carried by each frame, a track onwhich the frames areomovably supported, a movable endless chain, means for detachably connecting each frame to said chain and a core bar for holding the work iece in the path of the rollers.

3. n a rolling mill, a track, a frame movable thereon, rollers carried by said frame, an endless. chain, means for detachably connecting said frame to said chain and a core bar for holding the work piece in the path of the rollers on the frame.

4. In a rolling mill, a frame, rollers carried thereby, a track for said frame, an endless chain, means for connecting said frame thereto, a wedge shaped piece 2 on the rear of the track adapted to engage a portion of the connectin from the chain and a core bar for holding the work piece in the ath ,of the rollers.

In testimony w ereof I have signed my name to this specification in the presence of two subscribing witnesses OTTO HEER.

Witnesses:

, A. LIEBERKNECHT, G. A. WEDMAnN.

means for disconnecting the frame. 

